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// SPDX-License-Identifier: GPL-2.0-or-later
/* User authentication for vtysh.
* Copyright (C) 2000 Kunihiro Ishiguro
*/
#include <zebra.h>
#include <lib/version.h>
#include <pwd.h>
#ifdef USE_PAM
#include <security/pam_appl.h>
#ifdef HAVE_PAM_MISC_H
#include <security/pam_misc.h>
#endif
#ifdef HAVE_OPENPAM_H
#include <security/openpam.h>
#endif
#endif /* USE_PAM */
#include "memory.h"
#include "linklist.h"
#include "command.h"
#include "vtysh/vtysh_user.h"
/*
* Compiler is warning about prototypes not being declared.
* The DEFUNSH and DEFUN macro's are messing with the
* compiler I believe. This is just to make it happy.
*/
#ifdef USE_PAM
static int vtysh_pam(const char *);
#endif
int vtysh_auth(void);
void vtysh_user_init(void);
extern struct list *config_top;
extern void config_add_line(struct list *config, const char *line);
#ifdef USE_PAM
static struct pam_conv conv = {PAM_CONV_FUNC, NULL};
static int vtysh_pam(const char *user)
{
int ret, second_ret;
pam_handle_t *pamh = NULL;
/* Start PAM. */
ret = pam_start(FRR_PAM_NAME, user, &conv, &pamh);
/* Is user really user? */
if (ret == PAM_SUCCESS)
ret = pam_authenticate(pamh, 0);
if (ret != PAM_SUCCESS)
fprintf(stderr, "vtysh_pam: Failure to initialize pam: %s(%d)",
pam_strerror(pamh, ret), ret);
second_ret = pam_acct_mgmt(pamh, 0);
if (second_ret != PAM_SUCCESS)
fprintf(stderr, "%s: Failed in account validation: %s(%d)",
__func__, pam_strerror(pamh, second_ret), second_ret);
/* close Linux-PAM */
second_ret = pam_end(pamh, ret);
if (second_ret != PAM_SUCCESS) {
pamh = NULL;
fprintf(stderr,
"vtysh_pam: failed to release authenticator: %s(%d)\n",
pam_strerror(pamh, second_ret), second_ret);
exit(1);
}
return ret == PAM_SUCCESS ? 0 : 1;
}
#endif /* USE_PAM */
struct vtysh_user {
char *name;
uint8_t nopassword;
};
struct list *userlist;
static struct vtysh_user *user_new(void)
{
return XCALLOC(MTYPE_TMP, sizeof(struct vtysh_user));
}
static struct vtysh_user *user_lookup(const char *name)
{
struct listnode *node, *nnode;
struct vtysh_user *user;
for (ALL_LIST_ELEMENTS(userlist, node, nnode, user)) {
if (strcmp(user->name, name) == 0)
return user;
}
return NULL;
}
void user_config_write(void)
{
struct listnode *node, *nnode;
struct vtysh_user *user;
char line[128];
for (ALL_LIST_ELEMENTS(userlist, node, nnode, user)) {
if (user->nopassword) {
snprintf(line, sizeof(line), "username %s nopassword",
user->name);
config_add_line(config_top, line);
}
}
}
static struct vtysh_user *user_get(const char *name)
{
struct vtysh_user *user;
user = user_lookup(name);
if (user)
return user;
user = user_new();
user->name = strdup(name);
listnode_add(userlist, user);
return user;
}
DEFUN (vtysh_banner_motd_file,
vtysh_banner_motd_file_cmd,
"banner motd file FILE",
"Set banner\n"
"Banner for motd\n"
"Banner from a file\n"
"Filename\n")
{
int idx_file = 3;
return cmd_banner_motd_file(argv[idx_file]->arg);
}
DEFUN (vtysh_banner_motd_line,
vtysh_banner_motd_line_cmd,
"banner motd line LINE...",
"Set banner\n"
"Banner for motd\n"
"Banner from an input\n"
"Text\n")
{
int idx = 0;
char *motd;
argv_find(argv, argc, "LINE", &idx);
motd = argv_concat(argv, argc, idx);
cmd_banner_motd_line(motd);
XFREE(MTYPE_TMP, motd);
return CMD_SUCCESS;
}
DEFUN (username_nopassword,
username_nopassword_cmd,
"username WORD nopassword",
"\n"
"\n"
"\n")
{
int idx_word = 1;
struct vtysh_user *user;
user = user_get(argv[idx_word]->arg);
user->nopassword = 1;
return CMD_SUCCESS;
}
int vtysh_auth(void)
{
struct vtysh_user *user;
struct passwd *passwd;
if ((passwd = getpwuid(geteuid())) == NULL) {
fprintf(stderr, "could not lookup user ID %d\n",
(int)geteuid());
exit(1);
}
user = user_lookup(passwd->pw_name);
if (user && user->nopassword)
/* Pass through */;
else {
#ifdef USE_PAM
if (vtysh_pam(passwd->pw_name))
exit(0);
#endif /* USE_PAM */
}
return 0;
}
char *vtysh_get_home(void)
{
struct passwd *passwd;
char *homedir;
if ((homedir = getenv("HOME")) != NULL)
return homedir;
/* Fallback if HOME is undefined */
passwd = getpwuid(getuid());
return passwd ? passwd->pw_dir : NULL;
}
void vtysh_user_init(void)
{
userlist = list_new();
install_element(CONFIG_NODE, &username_nopassword_cmd);
install_element(CONFIG_NODE, &vtysh_banner_motd_file_cmd);
install_element(CONFIG_NODE, &vtysh_banner_motd_line_cmd);
}
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